private int MeasureHeight_ToolWindow()
{
if (DockPane.IsAutoHide || Tabs.Count <= 1)
return 0;
int height = Math.Max(this.TextFont.Height, ToolWindowImageHeight + ToolWindowImageGapTop + ToolWindowImageGapBottom)
+ ToolWindowStripGapTop + ToolWindowStripGapBottom;
return height;
}