private void OnCanvasMouseDown(object sender, MouseButtonEventArgs e)
{
//if (e.LeftButton == MouseButtonState.Pressed)
//{
var pos = e.GetPosition(LadderCanvas);
var intPoint = IntPoint.GetIntpointByDouble(pos.X, pos.Y, 300);
if (!IsSingleSelected())
{
AcquireSelectRect();
}
_parent.SelectionRect.X = intPoint.X;
_parent.SelectionRect.Y = intPoint.Y;
//}
}
