diff --git a/src/blocks/Block.as b/src/blocks/Block.as
index 44f00ca..f9d38cf 100644
--- a/src/blocks/Block.as
+++ b/src/blocks/Block.as
@@ -807,21 +807,32 @@ public class Block extends Sprite {
 		Scratch.app.gh.grabOnMouseUp(newStack);
 	}
 
-	public function deleteStack():void {
-		if (isProcDef() || isEmbeddedInProcHat()) return; // don't delete procedure definition this way for now
-		if (parent == null) return;
+	public function deleteStack():Boolean {
+		if (op == 'proc_declaration') {
+			return (parent as Block).deleteStack();
+		}
+		var app:Scratch = Scratch.app;
 		var top:Block = topBlock();
+		if (op == Specs.PROCEDURE_DEF && app.runtime.allCallsOf(spec, app.viewedObj()).length) {
+			DialogBox.notify('Cannot Delete', 'To delete a block definition, first remove all uses of the block.', stage);
+			return false;
+		}
+		if (top == this && app.interp.isRunning(top, app.viewedObj())) {
+			app.interp.toggleThread(top, app.viewedObj());
+		}
 		// TODO: Remove any waiting reporter data in the Scratch.app.extensionManager
 		if (parent is Block) Block(parent).removeBlock(this);
-		else parent.removeChild(this);
+		else if (parent) parent.removeChild(this);
 		this.cacheAsBitmap = false;
 		// set position for undelete
 		x = top.x;
 		y = top.y;
 		if (top != this) x += top.width + 5;
-		Scratch.app.runtime.recordForUndelete(this, x, y, 0, Scratch.app.viewedObj());
-		Scratch.app.scriptsPane.saveScripts();
-		Scratch.app.runtime.checkForGraphicEffects();
+		app.runtime.recordForUndelete(this, x, y, 0, app.viewedObj());
+		app.scriptsPane.saveScripts();
+		app.runtime.checkForGraphicEffects();
+		app.updatePalette();
+		return true;
 	}
 
 	public function attachedCommentsIn(scriptsPane:ScriptsPane):Array {
diff --git a/src/scratch/BlockMenus.as b/src/scratch/BlockMenus.as
index b4f33a5..35569c2 100644
--- a/src/scratch/BlockMenus.as
+++ b/src/scratch/BlockMenus.as
@@ -523,9 +523,9 @@ public class BlockMenus implements DragClient {
 		if (!isInPalette(block)) {
 			if (!block.isProcDef()) {
 				m.addItem('duplicate', duplicateStack);
-				m.addItem('delete', block.deleteStack);
-				m.addLine();
 			}
+			m.addItem('delete', block.deleteStack);
+			m.addLine();
 			m.addItem('add comment', block.addComment);
 		}
 		m.addItem('help', block.showHelp);
diff --git a/src/ui/BlockPalette.as b/src/ui/BlockPalette.as
index 0a2d6e4..6f0e28a 100644
--- a/src/ui/BlockPalette.as
+++ b/src/ui/BlockPalette.as
@@ -54,7 +54,6 @@ public class BlockPalette extends ScrollFrameContents {
 
 	public function handleDrop(obj:*):Boolean {
 		// Delete blocks and stacks dropped onto the palette.
-		var app:Scratch = root as Scratch;
 		var c:ScratchComment = obj as ScratchComment;
 		if (c) {
 			c.x = c.y = 20; // postion for undelete
@@ -63,30 +62,11 @@ public class BlockPalette extends ScrollFrameContents {
 		}
 		var b:Block = obj as Block;
 		if (b) {
-			if ((b.op == Specs.PROCEDURE_DEF) && hasCallers(b, app)) {
-				DialogBox.notify('Cannot Delete', 'To delete a block definition, first remove all uses of the block.', stage);
-				return false;
-			}
-			if (b.parent) b.parent.removeChild(b);
-			Scratch.app.runtime.recordForUndelete(b, b.x, b.y, 0, Scratch.app.viewedObj());
-			app.scriptsPane.saveScripts();
-			app.updatePalette();
-			return true;
+			return b.deleteStack();
 		}
 		return false;
 	}
 
-	private function hasCallers(def:Block, app:Scratch):Boolean {
-		var callCount:int;
-		for each (var stack:Block in app.viewedObj().scripts) {
-			// for each block in stack
-			stack.allBlocksDo(function (b:Block):void {
-				if ((b.op == Specs.CALL) && (b.spec == def.spec)) callCount++;
-			});
-		}
-		return callCount > 0;
-	}
-
 	public static function strings():Array {
 		return ['Cannot Delete', 'To delete a block definition, first remove all uses of the block.'];
 	}