I'm binding my GridView to a custom report class with records.   The `Report`class has a list of field types that is not known until runtime.  It exposes an array of `Record` objects.  The Record class derives from System::DynamicObject.  Binding an IEnumerable<Record> to GridView is pretty easy with the AutoGenerateColumns turned on.    (Note this code is C++/CLI but the client code that uses it is C#/WPF/XAML)

public ref class Record 
    : public DynamicObject
{
    int     m_row;
    Report^ m_rep;

public:
    Record(Report^ rep, int row);
#pragma region DynamicObject Overrides
    virtual bool TryGetMember(GetMemberBinder^ binder, [SRI::Out]Object^% obj) override;
    virtual bool TrySetMember(SetMemberBinder^ binder, Object^ value) override;
    virtual IEnumerable<String^>^ GetDynamicMemberNames () override;
    virtual bool TryGetIndex(GetIndexBinder^ binder, array<Object^>^ indices, [SRI::Out]Object^% result) override;
#pragma endregion 
    
    property Object^    default[int]  { Object^ get(int idx); }
    property Object^    default[String^] { Object^ get(String^ name); }
};

<tk:RadGridView.Resources>
    <DataTemplate x:Key="MyDoubleTemplate" DataType="{x:Type sys:Double}">
        <Label ContentStringFormat="{}{0:F3" Content="{Binding}"/>
    </DataTemplate>
</tk:RadGridView.Resources>

So I tried adding a handler for the `AutoGeneratingColumn` column event.  In the handler and explicitly specifying the `CellTemplate` to be used for each column.  (I named the templates in XAML and then loaded them directly via TryFindResource)

private void GridView_OnAutoGeneratingColumn(object? sender, GridViewAutoGeneratingColumnEventArgs e)
{
    if (e.Column is not GridViewDataColumn col)
        return;
    
    var name = col.DataMemberBinding.Path.Path;

    if (!TryGetField(name, out var field, out var rep))
        return;

    // Based on the field type, use a default DataTemplate that we previously loaded via TryFindResourcee

    switch (field.PropType)
    {
    case PropType.Double:  col.CellTemplate = DoubleTemplate; col.DataType = typeof(double); break;

    // NOTE: Other types/templates not shown for brevity. 

    default:
        e.Cancel = true;         break;  // Some type we don't recognize

    }

    col.CellEditTemplate = null;
}

But this fails too.  The value supplied to my `DataTemplate' binding is not the individual record field double value, it is the entire Record object.     Likewise every other template reports errors because it is expecting the individual column double/int/string, etc but instead getting the whole `Record` object.

Next I tried using the CellTemplateSelector approach.,  I created one and then set THAT in the event handler above.  But the problem remained the same.  The selector's SelectTemplate method was receiving an object of type Record  

 OK, then I looked at your XAML-SDK where you show a nice example of binding to `ICustomTypeDescriptor`  (the BindingToCustomTypeDescriptor example).  That was a lot of work.  I made my Record class implement that interface just as in your exmaple.  I see its methods being called..  Hooked it up to the GridView. 

But results are exactly the same.  GridView still supplies the Record value instead of the individual cell value to the bindings.

Please tell me what I am doing wrong...

I'm using the latest version of Telerik UI for WPF - Framework 4.8

and i have the same issue as described here: https://www.telerik.com/forums/the-scroll-bars-are-placed-in-the-tables

from April .. 

Will this issue get fixed sometime soon ? 

or is there a quick fix ?

Want to select cell and freeze this selection by pushing a separate button. Cell should remains in selection state with loosing focus, selecting other cells. Another button will unfreeze all cells in the grid.

Is it possible?

Thanks,

I want to select cell, perform some action on the cell value (focus is gone from cell now) and mark this cell as "processed".

I have a button to clear such "permanent" selections.

Is it possible? I saw multiple solutions based on overriding cell selection styles in xaml. Want to make it from view model.

I would like to indicate/emphasize cells selected for the action.

Example scenario:

1. select 2 cells in the grid;

2. perform some action after pushing separate button "Process selection";

3. now i need to show those previously selected 2 cells despite of clicks on other grid cells or loosing focus on the grid.

There is another button "View All" which will reset grid and clear all "permanently" selected cells.

Looking for suggestions to implement such behavior. Thinking about changing background color, making cell text bold, disabling cells. Any ideas?

CellStyleSelector sample from xaml_sdk demonstrates a static custom cell selection in columns overriding xaml styles. I need to make it dynamic: select cell, perform action, mark cell as processed, select another cell, process it, unmark previous cell, mark new one as processed.

Thank you,

Gennady

Good day! Which template is responsible for tooltip while dragging or resizing task? Can we customize this object?

Thank You for answers

In code behind, when a user moves the curser in the RadRichTextBox, we check information tagged to span elements. For certain spans, we want the contents to change color, so we set span.ForeColor to a new value, but this doesn't reflect in the UI. I assume there is some update mechanism, but it isn't obvious. I can select the entire span, copy, and paste it in place and it will show the new color, but we want it to happen when a user is moving the cursor.

We're tracking the cursor in the RadDocument.CaretPosition.PositionChanged event handler.

I'm investigating why / how to improve the rendering speed of a rather complex UserControl / Window 

The Window contains a Tab-Control where one of these tabs contain a GridView which is very basic on its own. 

Each of the ~60 rows are bound to an object which has a String + 3x bool properties.

Each time the Window is opene, the list is reset. 

The list of elements is kept in an ObservableCollection (which isn't necessary since the list never change.. but what the heck)

Here's the thing - when Profiling, this Gridview spends 600 msec !! in the Layout phase on the UI Thread... 600 msec !

Is there anything i can do about it ?

(To be honest - the standard WPF ListView spends 2200 msec rendering this list !!!)

I'm aware of https://docs.telerik.com/devtools/wpf/controls/radgridview/performance/tips-tricks

- The container has a fixed size

- Each column has a fixed width

- Row Virtualization is enabled

- Scrollbars har hardcoded to be enabled/disabled in advance. 

- Removing the CellTemplates didn't make a difference - time is still ~600msec

- The last thing i havent tried is using the lightweight styling, but i have some bad experiences with those. 

<telerik:RadGridView x:Name="lvCompanyFabrikater"
			            telerik:StyleManager.Theme="Fluent"
			            AutoGenerateColumns="False"
			            Background="{DynamicResource MahApps.Brushes.ThemeBackground}"
			            CanUserFreezeColumns="False"
			            CanUserSearch="False"
			            CanUserSearchInHiddenColumns="False"
			            EnableRowVirtualization="True"
			            GridLinesVisibility="None"
			            GroupRenderMode="Flat"
			            IsFilteringAllowed="True"
			            IsPropertyChangedAggregationEnabled="False"
			            IsReadOnly="True"
			            RowIndicatorVisibility="Collapsed"
			            ScrollViewer.HorizontalScrollBarVisibility="Disabled"
			            ScrollViewer.VerticalScrollBarVisibility="Visible"
			            SelectionMode="Single"
			            ShowGroupPanel="False">
	<telerik:RadGridView.Columns>

		<telerik:GridViewDataColumn Width="100"
					                DataMemberBinding="{Binding FabrikatNavn}"
					                Header="Fabrikat" />

		<telerik:GridViewDataColumn Width="50" Header="Salg">
			<telerik:GridViewDataColumn.CellTemplate>
				<DataTemplate>
					<CheckBox IsChecked="{Binding Salg}" />
				</DataTemplate>
			</telerik:GridViewDataColumn.CellTemplate>
		</telerik:GridViewDataColumn>

		<telerik:GridViewDataColumn Width="60" Header="Service">
			<telerik:GridViewDataColumn.CellTemplate>
				<DataTemplate>
					<CheckBox IsChecked="{Binding Service}" />
				</DataTemplate>
			</telerik:GridViewDataColumn.CellTemplate>
		</telerik:GridViewDataColumn>

		<telerik:GridViewDataColumn Width="85" Header="Reservedele">
			<telerik:GridViewDataColumn.CellTemplate>
				<DataTemplate>
					<CheckBox IsChecked="{Binding Reservedele}" />
				</DataTemplate>
			</telerik:GridViewDataColumn.CellTemplate>
		</telerik:GridViewDataColumn>

	</telerik:RadGridView.Columns>
</telerik:RadGridView>

After opening the RadComboBox in RadGridView (GridViewComboBoxColumn), it is displaying values are in the dropdown.
Scenario-1:
Now, if I don't select any value in the dropdown list (while it is in open) and also click the button. In the 1st click, the dropdown is closed and only in the 2nd click 
button will trigger the function.

I've attached my demo project for your reference. Can you please help me to fix the above issue on the 1st click itself? Is there any possible way to do it, if so please guide me.

Thanks in advance.