<telerik:RadComboBox
    ID="ddlValue"
    runat="server"
    AllowCustomText="True"
    Width="320px"
    MarkFirstMatch="True"
    AutoCompleteSeparator=";"
    AutoPostBack="true"
    OnSelectedIndexChanged="ddlValue_SelectedIndexChanged">
</telerik:RadComboBox>

And this code-behind

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        var datasource = new RadComboBoxItemCollection(ddlValue)
        {
            new RadComboBoxItem("", ""),
            new RadComboBoxItem("David Larkin", Guid.NewGuid().ToString()), 
            new RadComboBoxItem("Ahmed Warreth", Guid.NewGuid().ToString()), 
            new RadComboBoxItem("Ryan Estes", Guid.NewGuid().ToString()), 
            new RadComboBoxItem("Antonio Siqueira", Guid.NewGuid().ToString())
        };
 
        ddlValue.DataSource = datasource;
        ddlValue.DataTextField = "Text";
        ddlValue.DataValueField = "Value";
        ddlValue.DataBind();
    }
}
 
protected void ddlValue_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
{
    ltrSelection.Text = (sender as RadComboBox).Text;
}
I'm experiencing the following behaviour:

1. Choose David Larkin from the combo box
2. David Larkin appears in the label as expected
3. Place the cursor in the combo box at the end of the text, type ";Ah" and press Enter
4. David Larkin;Ahmed Warreth appears in the label as expected
5. Choose the first item in the combo box
6. I would expect the text of the combo box to become an empty string, but it is actually "David Larkin;"

I have  radgrid  which  displays information on 2 grouping levels
Based on selction from dropdown  above the radgrid, it retrieves the  Radgrid.

On first load of the page or whenever there is change in the selection in the search drop down. I need the Group1 not to  expand and  user should able to expand the group  which should result the groups inside it  and then  expand I should able to expand the 2nd group again.

I was  able to to do the following  in the load

If Not IsPostBack Then

 RadGrid1.MasterTableView.GroupsDefaultExpanded = False

Else

 RadGrid1.MasterTableView.GroupsDefaultExpanded = True   <--- I have to do this otherwise it stays FALSE on subsequest page loads

End If

And on the change selection of dropdown I am doing

RadGrid1.MasterTableView.GroupsDefaultExpanded = FALSE

With the above codigng  the first load of grid  displays fine with not expanded , when i click on the group expand button, the symbol changes that it expanded but it does not display the expanded groups. Now If I clcik again the same buttons ,it shows  everything with all 2 level groups also  expanded .
So basically on  1st time you don't see any change in the display of screen ( except the higher level group shows expanded sysmbol).
Clicking on it agian  it shows everything expanded.

How to control the two level groupings for the scenario I mentioned above.

Thanks
 

Also, can I set the expressions clientside.
I can set it serverside using the following;

rgvGrid.MasterTableView.GroupByExpressions.Add(New GridGroupByExpression(strExpression))

Thank you for your assistance.