Question

I would like to add a column from behind code to a data bound ASPxTreeList . The column i wanted to add is always is the first column before the datafield of my table.

I manually set the visible index=0 but the datafield of my table having the visibleIndex=0 as well , so the layout of the result of the unbound column will be displayed as second column instead of first.

Is that anyway to always make sure the unbound column i added is always at the first column even with the databound ASPxTreeList?

The similar situation just like setting the SettingsSelection.Enabled=true , then the checkbox column will be shown at the first column.

Answer 1

Have you tried inserting column with Columns.Insert: treeList.Columns.Insert(0, column)
EDIT: I tested my solution and this is conclusion:
Columns.Insert and column.VisibleIndex = 0 works.
Columns.Add and column.VisibleIndex = 0 doesn’t work.

protected void treeList_OnInit(object sender, EventArgs e)
{
    TreeListTextColumn column = new TreeListTextColumn {Name = "Unbound", VisibleIndex = 0};
    // works 
    treeList.Columns.Insert(0, column);
    // doesn't work
    //treeList.Columns.Add(column);
}