Performance problems when a RadGridView's inside a Popup?

[Robert Rossney]

Ordinarily, if I hide/show an element containing a RadGridView, when I show it the first time, it takes around a half second to initialize, but when I show it a second time it appears almost instantaneously.

Unless I put it in a Popup, as I discovered when trying to implement a ComboBox-like UserControl.  Then it initializes every time the Popup is displayed.  The RadGridView in this example is bound to a collection containing three strings, and it takes about a half second to display every time I click on the ToggleButton:

        <DockPanel>

            <ToggleButton DockPanel.Dock="Top"

                            x:Name="Toggle">Show/Hide</ToggleButton>

                

            <Popup IsOpen="{Binding ElementName=Toggle, Path=IsChecked}"

                    Placement="Bottom">

                <Controls:RadGridView ItemsSource="{Binding Strings}"

                                        ShowGroupPanel="False"

                                        AutoGenerateColumns="False">

                    <Controls:RadGridView.Columns>

                        <Controls:GridViewDataColumn IsFilterable="False"

                                                        IsGroupable="False"

                                                        IsReadOnly="True"

                                                        SortingState="Ascending"

                                                        Header="String"

                                                        DataMemberBinding="{Binding}" />

                    </Controls:RadGridView.Columns>

                </Controls:RadGridView>

            </Popup>

        </DockPanel>

Is there something I can do to get around this?  I'd really like to avoid having to go back to using a ListView in my control.

Thanks,

Robert

[Vlad]

Hi Robert,

 You need to set Height for this Popup since in the current declaration the grid will be measured with infinity and will try to create all rows at once. No UI virtualization in this case. 

All the best,
Vlad
the Telerik team

[Robert Rossney]

I'm already setting MaxHeight on the Popup.  Does the RadGridView still measure to infinity if MaxHeight is set?  If so, why?  If not, then what else might be causing this issue?

[Vlad]

Hi,

 I've just tried this however everything worked fine on my end. You can check the attached application for reference. 

Best wishes,
Vlad
the Telerik team

[Kais]

Hi there, 

I've just tried to put a grid inside a popup and got a huge lag to show the popup. Around 2-10 seconds in some cases. Interestingly your sample doesnt hang (only the first open is a bit slow, after that no). 

I am looking but honestly can't see anything significantly different between the two usages. I'll dig deeper ... 

[Kais]

Hi there, 

I've just tried to put a grid inside a popup and got a huge lag to show the popup. Around 2-10 seconds in some cases. Interestingly your sample doesnt hang (only the first open is a bit slow, after that no). 

I am looking but honestly can't see anything significantly different between the two usages. I'll dig deeper ...