Apparently, adding the line

lst.SelectedItemIndex = -1;

before

lst.SelectedItemIndex = 0;

seems to work



wrote in message news:10447@news.labs.infragistics.com...
> Apparently a decision was made when creating the ListTool that setting the
> SelectedItemIndex when it is displaying check marks should toggle the
> check mark.
>
> However, the fact that you are clearing the collection and it is
> maintaining the selected index sounds like a bug and I would recommend
> submitting the issue to the support group:
> http://devcenter.infragistics.com/Protected/SubmitSupportIssue.Aspx.
>
> As a workaround, you can just get the SelectedItemIndex before setting it.
> If it is already 0, don't set it to 0 again.
>

My issue is, I am populating a listtool with data and having
the first item selected, This is called from a procedure when a
button is clicked. This works great the first time,
however, if I call it a 2nd time it does not check the first item (i think
it is unchecking it),
but if I call it a third time it does check the item. It does it every
other time.


I think the lst.SelectedItemIndex = 0; line checks it if it is
unchecked and then unchecks it if it is checked.
Somehow the lst.ListToolItems.Clear();
does not change the state of the initial checked indexed item?



public void AddVersions() //Populate listversion listtool and set to most
recent
{

DataTable dt = DatabaseImplementation.GetIFTVer("GetIFTVersion", IFT.IFTNo);
DataTableReader rd = dt.CreateDataReader();

ListTool lst = this.ultraToolbarsManager1.Tools["lstVersions"] as ListTool;
string value;
string text;

//Delete any existing versions
lst.ListToolItems.Clear();


while (rd.Read())
{
value = rd["Version"].ToString();
text = rd["Description"].ToString();
lst.ListToolItems.Add(value, text);
}


//Have the first item checked by default
lst.SelectedItemIndex = 0;

}



wrote in message news:10435@news.labs.infragistics.com...
>I figured it out, I was adding my data to the (key, text) properties and
>not
> (value, text).
>
>
>
> wrote in message news:10432@news.labs.infragistics.com...
>> Does anyone know why I keep getting this error?
>>
>> ListTool lst =
>> ((Infragistics.Win.UltraWinToolbars.ListTool)this.ultraToolbarsManager1.Tools["lstVersions"]);
>>
>> MessageBox.Show(lst.SelectedItem.Value.ToString());
>>
>>
>>
>> An unhandled exception of type 'System.NullReferenceException' occurred
>> in
>> Market Forecaster.exe
>>
>> Additional information: Object reference not set to an instance of an
>> object.
>>
>> The value is defintely not null.
>>
>