--- a/UIPainterView.st	Wed Aug 20 17:57:49 1997 +0200
+++ b/UIPainterView.st	Wed Aug 20 18:06:03 1997 +0200
@@ -305,9 +305,11 @@
 
 !UIPainterView methodsFor:'drag & drop'!
 
-canDrop:anObjectOrCollection
-    anObjectOrCollection size == 1 ifTrue:[
-        ^ self canPaste:(anObjectOrCollection first theObject)
+canDrop:something
+    "returns true if something can be droped
+    "
+    (something size == 1 and:[self enabled and:[self numberOfSelections <= 1]]) ifTrue:[
+      ^ something first theObject isKindOf:UISpecification
     ].
     ^ false
 !
@@ -359,8 +361,13 @@
 drop:anObjectOrCollection at:aPoint
     |spec newSel oldSel dragOffset|
 
-    (oldSel := selection) isCollection ifTrue:[
-        oldSel := selection copy
+    self selection notNil ifTrue:[
+        oldSel := self singleSelection.
+
+        (self canPasteInto:oldSel) ifFalse:[
+            oldSel := nil.
+            self setSelection:nil withRedraw:true
+        ]
     ].
     spec := (anObjectOrCollection at:1) theObject.
     dragOffset := DragAndDropManager dragOffsetQuerySignal raise.
@@ -368,30 +375,56 @@
 
     oldSel isNil ifTrue:[self select:newSel]
                 ifFalse:[self select:oldSel]
-
-    "Modified: 11.8.1997 / 16:41:52 / cg"
 ! !
 
 !UIPainterView methodsFor:'generating output'!
 
 generateActionMethodFor:aspect spec:protoSpec inClass:targetClass
-    |args showIt|
+    |selector args showIt code alreadyInSuperclass|
+
+    selector := aspect asSymbol.
 
-    (aspect asSymbol numArgs) == 1 ifFalse:[
-        args := '\'.
+    alreadyInSuperclass := targetClass superclass canUnderstand:selector.
+
+    (selector numArgs) == 1 ifFalse:[
+        args := ''.
         showIt := ' ...''.\'.
     ] ifTrue:[
-        args := 'anArgument\'.
+        args := 'anArgument'.
         showIt := ''' , anArgument printString , '' ...''.\'.
     ].
 
-    ^ ('!!' , targetClass name , ' methodsFor:''actions''!!\\' ,
-      aspect , args ,
-      '    "automatically generated by UIPainter ..."\' ,
-      '\' ,
-      '    "action to be added ..."\' ,
-      '    Transcript showCR:self class name , '': action for ' , aspect , showIt ,
-      '!! !!\\') withCRs
+    code := '!!' , targetClass name , ' methodsFor:''actions''!!\\' ,
+                aspect , args , '\' ,
+                '    "automatically generated by UIPainter ..."\' ,
+                '\' .
+
+    alreadyInSuperclass ifTrue:[
+        code := code ,
+                    '    "action for ' , aspect , ' is already provided in a superclass."\' ,
+                    '    "It may be redefined here ..."\\'.
+    ] ifFalse:[
+        code := code ,
+                    '    "action to be added ..."\\'.
+    ].
+
+    code := code ,
+                '    Transcript showCR:self class name, '': '.
+    alreadyInSuperclass ifTrue:[
+        code := code , 'inherited '.
+    ].
+    code := code , 'action for ' , aspect , showIt.
+
+    alreadyInSuperclass ifTrue:[
+        code := code ,
+                        '    super ' , aspect , args , '.\'.
+    ].
+
+    code := code ,
+                '!! !!\\'.
+    ^ code withCRs
+
+    "Modified: 19.8.1997 / 12:03:20 / cg"
 !
 
 generateAspectMethodFor:aspect spec:protoSpec inClass:targetClass