/// <summary>
/// Set draw area to all form client space except toolbar
/// </summary>
private void ResizeDrawArea()
{
var bounds = drawArea.GetBounds();
//drawArea.Left = 0;
//drawArea.Top = 0;
drawArea.Width = Math.Max(this.pnlDrawArea.ClientRectangle.Width, (int)Math.Round((bounds.Left + bounds.Width + 10) * drawArea.Zoom));
drawArea.Height = Math.Max(this.pnlDrawArea.ClientRectangle.Height, (int)Math.Round((bounds.Top + bounds.Height + 10) * drawArea.Zoom));
this.pnlDrawArea.Invalidate();
;
}