Added support for setting the DISABLED attrivute via the DOM...

layout/forms/nsFormControlFrame.cpp

@@ -430,6 +430,9 @@ nsFormControlFrame::AttributeChanged(nsIPresContext* aPresContext,
                                      nsIAtom*        aAttribute,
                                      PRInt32         aHint)
 {
+  if (nsHTMLAtoms::disabled == aAttribute) {
+    mWidget->Enable(!nsFormFrame::GetDisabled(this));
+  } 
   return NS_OK;
 }
 

layout/html/forms/src/nsButtonControlFrame.cpp

@@ -205,6 +205,8 @@ nsButtonControlFrame::AttributeChanged(nsIPresContext* aPresContext,
       }
     } else if (nsHTMLAtoms::size == aAttribute) {
       nsFormFrame::StyleChangeReflow(aPresContext, this);
+    } else {
+      result = nsFormControlFrame::AttributeChanged(aPresContext, aChild, aAttribute, aHint);
     }
   }
   return result;

layout/html/forms/src/nsCheckboxControlFrame.cpp

@@ -190,7 +190,9 @@ nsCheckboxControlFrame::AttributeChanged(nsIPresContext* aPresContext,
         }
         NS_RELEASE(button);
       }
-    }   
+    } else {
+      result = nsFormControlFrame::AttributeChanged(aPresContext, aChild, aAttribute, aHint);
+    }
   }
   return result;
 }

layout/html/forms/src/nsFormControlFrame.cpp

@@ -430,6 +430,9 @@ nsFormControlFrame::AttributeChanged(nsIPresContext* aPresContext,
                                      nsIAtom*        aAttribute,
                                      PRInt32         aHint)
 {
+  if (nsHTMLAtoms::disabled == aAttribute) {
+    mWidget->Enable(!nsFormFrame::GetDisabled(this));
+  } 
   return NS_OK;
 }