How to add custom control to a column in the WinForms GridGroupingControl?
Custom control
In order to add custom control to a column of the WinForms GridGroupingControl, you can set the CellType property as Control and value of that control can be set to HTMLUIControl.
C#
Syncfusion.Windows.Forms.HTMLUI.HTMLUIControl htmluiControl1 = new Syncfusion.Windows.Forms.HTMLUI.HTMLUIControl();
//Set the column cell type as the html control.
GridColumnDescriptor column1 = this.gridGroupingControl1.TableDescriptor.GetColumnDescriptor("Column");
//Specify your Column name
column1.Appearance.AnyRecordFieldCell.CellType = GridCellTypeName.Control;
column1.Appearance.AnyRecordFieldCell.Control = htmluiControl1;VB
Dim htmluiControl1 As New Syncfusion.Windows.Forms.HTMLUI.HTMLUIControl()
'Set the column cell type as the html control.
Dim column1 As GridColumnDescriptor = Me.gridGroupingControl1.TableDescriptor.GetColumnDescriptor("Column")
'Specify your Column name
column1.Appearance.AnyRecordFieldCell.CellType = GridCellTypeName.Control
column1.Appearance.AnyRecordFieldCell.Control = htmluiControl1The screenshot below illustrates the addition of a custom control to a column in the GridGroupingControl.

Samples:
C#: CustomControl_CS
VB: CustomControl_VB