Hi Ching-Yen,
The RadStatusStrip control has the Spring property for its child elements. When you set it
true, it makes the corresponding element bigger and this pushes the following elements in the StatusBarBoxLayout to the right. In your case you should set the Spring property of the the second label to
true.
If I can of your further assistance, feel free to contact me.
All the best,
Nikolay
the Telerik team