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GridDropDownGridListControlCellRenderer cr = (GridDropDownGridListControlCellRenderer)
this.grid.CellRenderers["GridListControl"];
(( GridDropDownGridListControlPart) cr.ListControlPart).DropDownRows = 2; // 2 rows in the dropdown
If you need to do it on a column by column basis (or cell by cell), then you will have to handle the CurrentCellShowingDropDown event.
private void gridControl1_CurrentCellShowingDropDown(object sender, GridCurrentCellShowingDropDownEventArgs e) { GridControlBase grid = sender as GridControlBase; if(grid != null) { GridCurrentCell cc = grid.CurrentCell; GridComboBoxCellRenderer cr = cc.Renderer as GridComboBoxCellRenderer; if(cc != null) { if(cc.ColIndex == 6) ((GridComboBoxListBoxPart)cr.ListBoxPart).DropDownRows = 4; else if(cc.ColIndex == 4) ((GridComboBoxListBoxPart)cr.ListBoxPart).DropDownRows = 7; else if(cc.ColIndex == 2) ((GridComboBoxListBoxPart)cr.ListBoxPart).DropDownRows = 10; else ((GridComboBoxListBoxPart)cr.ListBoxPart).DropDownRows = 6; } } }