This behavior is related to how the control is measured while using the MS Form. In the given scenario, the control has many columns, and some of them are pinned. Moving to the last column and typing in the filter cell will filter the rows in the column. However, when filtering, if the row number is less than the viewport, the vertical scrollbar will disappear as it is not needed anymore, and the filter editor will be placed in the wrong column. This will mess with the filter cell editor. 

The search functionality is inconsistent in Unbound Mode. Typing a word highlights all rows that contain that word or string, as expected. However, if the cursor is moved and additional characters are typed at the beginning of the search box, no results are returned, even if matching rows exist that contain the updated string combination.

The same behavior is not observed in bound mode.

Clicking the filter icon will reopen the filter popup. In the following scenario, the filter pop-up is open. If we click the filter icon while the filter popup is open, it will close it and reopen it. This leaves the end user with flashing behavior. The filter icon should close the filter popup if it is open.

On the second opening, it corrects:

In the following scenario, we clicked on the GridViewSelectColumn header checkbox, which selects all the rows in the RadGridView. This will trigger the SelectionChanging event of the control. Canceling the event will cancel the whole operation. There is no API to remove specific rows from being selected in this operation.

In a hierarchy grid, when AutoGenerateColumns= true, this event triggers only for MasterTemplate.

In this scenario, we are using the custom approach from the How to Change PageViewMode for the Nested Levels in RadGridView KB article. When a child row is expanded and we collapse and expand its parent, an exception is thrown.

In this particular scenario, setting the EnableFiltering property to true will trigger the control to update its view. In some scenarios, an exception occurs when checking whether a column has a sort applied.

Pageing icons are not visible when the control is placed inside UserControl. The important part here is that the Form that is holding the UserControl is shown on a button click.

The reported behavior is observed in VisualStudio2022Light (or dark), VisualStudio2012, Office2013, Windows11.

When the BestFitColumns() method is used, the column width will be calculated to fit the content. In a scenario where the content is the longest one in the column, it will be next to the left and right side cell borders. When such a cell is selected and marked as a current cell, the current cell border will be applied, which will shrink the space for the content, and ellipses will appear.

The BestFitColumns() method needs to take into account the current cell border width in different themes.