There is no property to control this.
You can handle some events and prevent the drop. Here is code that worked for me in the ComboBoxCells sample.
bool clickOnCell = false;
private void gridControl1_CellClick(object sender, GridCellClickEventArgs e)
{
this.clickOnCell = true;
}
private void gridControl1_CurrentCellMoving(object sender, GridCurrentCellMovingEventArgs e)
{
this.clickOnCell = false;
}
private void gridControl1_CurrentCellShowingDropDown(object sender, GridCurrentCellShowingDropDownEventArgs e)
{
if(clickOnCell)
{
e.Cancel = true;
this.clickOnCell = false;
}
}