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Able to reset scrollbar postion in RadComboBox?

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Frank
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Frank asked on 16 Sep 2011, 08:58 PM
Is there a way to programatically reset the position of the thumb in the vertical scrollbar to the top?  Example: the user pulls down the ComboBox's list and scrolls down to the bottom, then selects the bottom item.  After the list has been repopulated with a different set of items, I would like to have the thumb be back at the top of the list when the user reopens the ComboBox.  Currently, the position of the thumb does not get reset when the ComboBox's list is repopulated.  It remains at the same position it was at when the ComboBox closed, even when the items have been replaced.

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Valeri Hristov
Telerik team
answered on 21 Sep 2011, 11:23 AM
Hi Frank,

There is no way to reset the scrollbar position. If you have a selected item, however, the scroll position should automatically change so that the selected item is visible every time you open the dropdown.

Best wishes,
Valeri Hristov
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Frank
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answered on 21 Sep 2011, 07:09 PM
Ok, I see, thanks for the information Valeri.
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Daniel
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answered on 23 Jan 2013, 06:59 PM
I know this is a REALLY old thread to be posting to. But this is one of the first google search results for "silverlight radcombobox scroll to top" So i thought i'd post for anyone else having this problem.

There is a workaround for resetting the scrollbar position in a RadComboBox. You just need to get the ScrollViewer from the template and scroll it to the top.

If you're extending the RadComboBox, here's the code for it:
public void ScrollToTop()
{
    var scrollViewer = GetTemplateChild("PART_ScrollViewer") as ScrollViewer;
    if (scrollViewer != null)
    {
        scrollViewer.ScrollToVerticalOffset(0);
    }
}

If you're not extending the RadComboBox, you should be able to modify the code to fit your needs easily
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Prashant
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answered on 02 Sep 2013, 12:10 PM
Is there anyway to programatically reset the position of the thumb in the vertical scrollbar to the top?  Example: the user pulls down the ComboBox's list and scrolls down to the bottom, then selects the bottom item.  After the list has been repopulated with a different set of items, I would like to have the thumb be back at the top of the list when the user reopens the ComboBox.  Currently, the position of the thumb does not get reset when the ComboBox's list is repopulated.  It remains at the same position it was at when the ComboBox closed, even when the items have been replaced.

Thanks in advance for the help .
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Kalin
Telerik team
answered on 03 Sep 2013, 02:45 PM
Hello Prashant,

There isn't built-in functionality in the ComboBox that allows you to reset the scrollbar position. However as an easy work-around I can suggest that in the method where you are inserting the new ComboBox items you could set the ComboBox SelectedItem to the first item of the collection in order to move the scrollbar up to the top. And if don't want any item to be selected you would just need to set the SelectedItem to null after that. Please see the code snippet below:

comboBox.SelectedItem = comboBox.Items[0];
comboBox.SelectedItem = null;

Hope this will help you.

Regards,
Kalin
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danparker276
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answered on 20 Dec 2013, 07:30 PM
This only seems to work if I make the drop down visible
 comboBox.IsDropDownOpen = true;
comboBox.SelectedItem = comboBox.Items[0];
comboBox.SelectedItem = null;
 comboBox.IsDropDownOpen = false;


Then it looks funny, cus it opens and closes.


Sorry, suggest code works, but I have to put it in the DropDownOpened event.
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Frank
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Valeri Hristov
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Frank
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Daniel
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Prashant
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Kalin
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danparker276
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