public void AddPicture(Bitmap bmp, bool isSelected)
{
var pict = new Picture(bmp);
pict.MoveBy(-20, -20);
_allPainting.Add(pict);
_redoStack.Clear();
if (isSelected)
SelectedPrimitive = pict;
UpdateCurrentTool();
_currentPrimitive = null;
Invalidate();
}