How to hide the Middle dockguide icon which is combination of all left,right,top,bottom icons.

Hi,

How to hide the middle icon of the dockguide while dragging the one toolwindow into other toolwindow.

Fow example.

<docking:SplitContainer><docking:DockSitex:Name="docksite1">

<docking:ToolWindowContainer><docking:ToolWindow Title="hello" HasTitleBar="True"></docking:ToolWindow>

</docking:ToolWindowContainer>

</docking:DockSite>

<docking:DockSitex:Name="docksite2">

<docking:ToolWindowContainer><docking:ToolWindow Title="hello1" HasTitleBar="True"></docking:ToolWindow>

</docking:ToolWindowContainer>

</docking:DockSite></docking:SplitContainer>

and these docksites are linked by

this.docksite1.LinkDockSite(docksite2);

this.docksite2.LinkDockSite(docksite1);

if i drag the toolwindow from the docksite1 and move the mouse in the docksite2 and stop the mouse then arrow icons will be displayed in the all four side positions and one icon for allcombined arrow icons will be displayed at the center of the docksite2.

So can i hide this icon for allcombined arrow icons which is displayed at the center of the docksite and left ,right,top,bottom icons at their respective position should display ?