diff --git a/src/net/torvald/terrarum/modulebasegame/TerrarumIngame.kt b/src/net/torvald/terrarum/modulebasegame/TerrarumIngame.kt
index c4a969e09..6ecc7ae9c 100644
--- a/src/net/torvald/terrarum/modulebasegame/TerrarumIngame.kt
+++ b/src/net/torvald/terrarum/modulebasegame/TerrarumIngame.kt
@@ -680,18 +680,25 @@ open class TerrarumIngame(batch: FlippingSpriteBatch) : IngameInstance(batch) {
         // what if there's multiple of such fixtures? whatever, you are supposed to DISALLOW such situation.
         for (kk in actorsUnderMouse.indices) {
             if (mouseInInteractableRange(actor) { _, _, _, _ ->
-                    actorsUnderMouse[kk].mainUI?.let {
-                    uiOpened = true
+                actorsUnderMouse[kk].let { fixture ->
+                    fixture.mainUI?.let { ui ->
+                        uiOpened = true
 
-                    // property 'uiFixture' is a dedicated property that the TerrarumIngame recognises.
-                    // when it's not null, the UI will be updated and rendered
-                    // when the UI is closed, it'll be replaced with a null value
-                    uiFixture = it
-                    it.setPosition(
-                            (Toolkit.drawWidth - it.width) / 4,
-                            (App.scr.height - it.height) / 4 // what the fuck?
-                    )
-                    it.setAsOpen()
+                        // property 'uiFixture' is a dedicated property that the TerrarumIngame recognises.
+                        // when it's not null, the UI will be updated and rendered
+                        // when the UI is closed, it'll be replaced with a null value
+                        uiFixture = ui
+                        ui.setPosition(
+                                (Toolkit.drawWidth - ui.width) / 4,
+                                (App.scr.height - ui.height) / 4 // what the fuck?
+                        )
+                        if (fixture.mainUIopenFun == null) {
+                            ui.setAsOpen()
+                        }
+                        else {
+                            fixture.mainUIopenFun!!.invoke(ui)
+                        }
+                    }
                 }
                 0L
             } == 0L) break
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureBase.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureBase.kt
index 171533c6c..8d718ff35 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureBase.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureBase.kt
@@ -145,6 +145,8 @@ open class FixtureBase : ActorWithBody, CuedByTerrainChange {
     @Transient var mainUI: UICanvas? = null
     var inventory: FixtureInventory? = null
 
+    @Transient var mainUIopenFun: ((UICanvas) -> Unit)? = null
+
     protected var actorThatInstalledThisFixture: UUID? = null
 
     protected constructor() : super(RenderOrder.BEHIND, PhysProperties.IMMOBILE, null)
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureWorkbench.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureWorkbench.kt
index 6d0de8e90..93dd59ac4 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureWorkbench.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureWorkbench.kt
@@ -1,10 +1,14 @@
 package net.torvald.terrarum.modulebasegame.gameactors
 
 import net.torvald.terrarum.BlockCodex
+import net.torvald.terrarum.INGAME
+import net.torvald.terrarum.Terrarum
 import net.torvald.terrarum.blockproperties.Block
 import net.torvald.terrarum.gameactors.AVKey
 import net.torvald.terrarum.langpack.Lang
+import net.torvald.terrarum.modulebasegame.TerrarumIngame
 import net.torvald.terrarum.modulebasegame.gameitems.FixtureItemBase
+import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull
 import net.torvald.terrarum.modulebasegame.ui.UIWallCalendar
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
 
@@ -18,7 +22,7 @@ class FixtureWorkbench : FixtureBase, CraftingStation {
     constructor() : super(
         BlockBox(BlockBox.ALLOW_MOVE_DOWN, 2, 1),
         nameFun = { Lang["ITEM_WORKBENCH"] },
-        mainUI = UIWallCalendar()
+        mainUI = (INGAME as? TerrarumIngame)?.uiInventoryPlayer
     ) {
         val itemImage = FixtureItemBase.getItemImageFromSingleImage("basegame", "sprites/fixtures/workbench.tga")
 
@@ -30,6 +34,10 @@ class FixtureWorkbench : FixtureBase, CraftingStation {
         }
 
         actorValue[AVKey.BASEMASS] = 20.0
+
+        mainUIopenFun = { ui ->
+            (mainUI as? UIInventoryFull)?.openCrafting(mainUI!!.handler)
+        }
     }
 
 }
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryFull.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryFull.kt
index eea45e15c..a6eadaf3b 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryFull.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryFull.kt
@@ -11,6 +11,7 @@ import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.gameactors.ActorHumanoid
 import net.torvald.terrarum.ui.Toolkit
 import net.torvald.terrarum.ui.UICanvas
+import net.torvald.terrarum.ui.UIHandler
 import net.torvald.terrarum.ui.UIItemHorizontalFadeSlide
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
 import net.torvald.unicode.*
@@ -251,12 +252,8 @@ class UIInventoryFull(
         // allow "control_key_gamemenu" to open this UI and bring system menu immediately
         this.handler.toggleKeyExtra.add("control_key_gamemenu" )
         this.handler.toggleKeyExtraAction.add {
-            if (it.isClosed) {
-                INGAME.setTooltipMessage(null)
-                transitionPanel.forcePosition(2)
-                catBar.setSelectedPanel(2)
-                it.setAsOpen()
-            }
+            if (it.isClosed)
+                openGamemenu(it)
             else if (it.isOpened)
                 setAsClose()
         }
@@ -264,20 +261,29 @@ class UIInventoryFull(
         // allow "control_key_crafting" to open this UI and bring system menu immediately
         this.handler.toggleKeyExtra.add("control_key_crafting")
         this.handler.toggleKeyExtraAction.add {
-            if (it.isClosed) {
-                INGAME.setTooltipMessage(null)
-                transitionPanel.forcePosition(0)
-                catBar.setSelectedPanel(0)
-                transitionalCraftingUI.resetUI()
-                it.setAsOpen()
-            }
+            if (it.isClosed)
+                openCrafting(it)
             else if (it.isOpened)
                 setAsClose()
         }
 
 
         rebuildList()
+    }
 
+    fun openGamemenu(it: UIHandler) {
+        INGAME.setTooltipMessage(null)
+        transitionPanel.forcePosition(2)
+        catBar.setSelectedPanel(2)
+        it.setAsOpen()
+    }
+
+    fun openCrafting(it: UIHandler) {
+        INGAME.setTooltipMessage(null)
+        transitionPanel.forcePosition(0)
+        catBar.setSelectedPanel(0)
+        transitionalCraftingUI.resetUI()
+        it.setAsOpen()
     }
 
     override fun show() {