Field Filters Not Visible when Filtering Control Is First Opened

Environment

Product Version	2022.3.912
Product	RadGridView for WPF

Description

The field filter controls (textboxes, comboboxes, etc.) of the FilteringControl popup of the RadGridView control are not displayed when the popup is first opened. Subsequently opening the popup displays the filters as expected.

Solution

Such an issue can occur if a custom FilteringControl is defined and its base constructor is not called. This happens because the default FilteringControl class initializes most of its logic (along with the filter editors) in its constructor.

To resolve this, ensure that the constructor of the base FilteringControl class is called:

public CustomFilteringControl(GridViewColumn column) : base(column) 
{ 
    // ... 
} 

You can then assign the custom filtering control as follows:

foreach (var column in GridView.Columns) 
{ 
    column.FilteringControl = new CustomFilteringControl(column); 
} 

See Also

• Popup Filtering
• Custom Filtering Controls