public void DeleteObject()
{
if (lstDrawings.SelectedIndex >= 0)
{
int i = lstDrawings.SelectedIndex;
DrawingItem obj = (DrawingItem)lstDrawings.Items[i];
dlgDrawings frm = this.Parent as dlgDrawings;
if (drawings.Remove(obj))
{
lstDrawings.Items.RemoveAt(i);
frm.DeleteDrawing(obj);
}
}
}
