How do I get correct location of textbox when placed in groupbox VB.NET , C#

"it goes off the way (Groupbox2)"

Sorry : groupbox doe not go off the way .its datagridview comes above textbox

i want to place the DataGridView over the GroupBox (when under the TextBox) ?

datagridview becomes visible when enter taxtbox and invisible when leave textbox.

i have a textbox (TbxSupCode) to enter supplier code and Datagridview (DgvSupCodeList) to show list of supplier code to select. Initially datagridview remains invisible. when entered in textbox i am positioning this datagrid below textbox starting from left of textbox and top of datagrid from bottom of texbox and make it visible (it will be invisible on leaving textbox) .For this i need to get the left and bottom of textbox for placing location of datagrid.

Along with other controls i have place this text box in Group box (GroupBox2) .I have below code to get the location point for datagrid.


Private Sub TbxSupCode_Enter(sender As Object, e As EventArgs) Handles TbxSupCode.Enter

Dim TbxRectangle As Rectangle = TbxSupCode.DisplayRectangle()
TbxRectangle.X += TbxSupCode.Left
TbxRectangle.Y += TbxSupCode.Top + TbxSupCode.Height

DgvSupCodeList.Location = New Point(TbxRectangle.X, TbxRectangle.Y)


End Sub

Problem is if i place this text box on form without inside any container i get the position of datagrid perfectly. but if i put this text box inside container ( like groupbox) it comes above textbox . i need to get this Datagrid below text box when in container.

I need to place in group box for better display as there are many controls on form. i will provide more details if required.