Empty space b/w treegrid view & split container panel

I am unable to remove the empty space between treegridview and splitercontainer panel. What i want is if we resize the panel the gridview should also be resized and there should not any empty space between them. Please suggest how to remove space .

 

The scenario is there is one splitContainerPanel  control in from so inside  splitContainerPanel1 there is one gCollapsableGroupBox and  Virtual tree grid view. In panel1 gCollapsableGroupBox is added

this.splitContainer1.Panel1.Controls.Add(this.gCollapsableGroupBox1)

in  gCollapsableGroupBox  , tree grid view is added

this.gCollapsableGroupBox1.Controls.Add(this.VirtualTreeGridView); 

 

If i add 

this.VirtualTreeGridView.Parent = this.splitContainer1.Panel1

then there wont be any space but the grid view is not visible .

Please Suggest how to solve this . ....

 

 Thanx in advance .