As a user I want be able to use FlagEnumEditor when RadPropertyGrid is bound to collection

It should be a themable editor which allows users to select a file or a directory from the file system using OpenFileDialog, FolderBrowserDialog or directly to type the full path to the file.

This issue has been reopen as the fix for it turned out to cause other problems. 

PropertyGridColumnResizer Resizing event.

An non edit mode is enabled in the control when the EditMode is set to Single. In this case, only one field can enter edit mode and the rest are read only. 

Currently, there is no API that allows you to customize the content (that shows the property value) of the read only fields.

Add an API that allows you to customize the read only content. Similar to the EditorTemplate of the PropertyDefinition.

 

Currently the AutomationID of the PropertyGridField is set to "{0}_FieldEditor", where {0} is the DisplayName of the property definition. We can introduce an option to prevent this.

Add the ability to add new items in the collection editor when binding to primitive types.

The CollectionEditor control has a ListBox on its left side, which has an indicator for the selected item when the Windows 11 theme is applied. Performing a selection and then reopening the drop-down to display the CollectionEditor, performing a selection does not update the indicator. It stays on the previously selected item prior to closing the drop-down.

 Add selected inactive state for PropertyGrid Field.

Exception when changing a non-visible bound property.

A memory leak occurs when RadPropertyGrid instaces are loaded/unloaded multiple times. 

The issue manifests even more if the PropertyGrid contains fields for editing DateType types. 

Nested properties are not loaded when the ComponenetType does not match the DeclarationType. The same setup is correctly presented when using the UI for WinForms' PropertyGrid.

Improve loading performance when IsGrouped="True" and AutoExpandGroups="True".

By the time being, a custom DataTemplate can be applied only for the EditorTemplate. When the EditMode is Single, a plain TextBlock is used for a readonly PropertyDefinition. With the Default EditMode, if the EditorTemplate is set, it will be displayed, but the user needs to stick to the default behavior provided by the ReadOnlyEditorState property (grayed out and disabled element for its Disabled value, and enabled interaction for the ReadOnly one). Provide an option to directly set a ReadOnlyTemplate for both EditModes.