private Listbox shapeListBox;
public void onClick$deleteBtn(Event event){
Window canvasBoardWindow = (Window) zkpaintWindow
.getFellow("canvasInc").getFellow("canvasBoardWindow");
Canvas cvs1 = (Canvas) canvasBoardWindow.getFellow("cvs1");
int size = shapeListBox.getItemCount();
System.out.println(size);
for(int i=size-1; i>-1; i--){
if(!shapeListBox.getItemAtIndex(i).isSelected()) continue;
System.out.println(i);
cvs1.remove(i);
((ListModelList) shapeListBox.getModel()).remove(i);
}
}