If the Common Palette is associated with a text editor then it's desired to allow users dragging and dropping text into
the palette to create new custom code clips that can be dropped into editor later on.

That can be achieved simply by subclassing the default DragAndDropHandler which manages all DragAndDrop-related
operations in the Common Palette and turning the text dnd support in superclasses's constructor on. The default
implementation pops up a dialog window when some text is dropped into the palette where user enters code clip name and
tooltip and optionally selects appropriate icons.