Hello, Narasimha.

The UltraTilePanel dynamically controls the size of each tile contained within it based on user interaction with the form. When tiles are moved around and resized within the panel, the contained controls are automatically sized to fill up the tile's area. The Size property of the individual tiles should generally not be set, as it will be overwritten by the UltraTilePanel.

I recommend modifying your usercontrol so that the text box is automatically resized to fit the width of its container. You can accomplish this either by docking the text box or by setting the left and right anchor.

Please let me know if you have any further questions.