Rename an object
When you add an object to the artboard in Microsoft Expression Blend, the object is listed in the Interaction panel under Objects and Timeline, with brackets [ ] around the object's type; for example, [Image], [Path], or [Ellipse]. When you have multiple objects of the same type in the same window, it can be hard to distinguish each object from others of the same type, unless you give each object a unique name. Additionally, if you plan to reference the object from a code-behind file, the object needs to be renamed
To rename an object
Do one of the following:
With the object selected on the artboard, enter the new name in the Name box of the Properties panel.
In the Interaction panel, under Objects and Timeline, right-click the object that you want to rename, select Rename, and then type the new name.
In the Interaction panel, under Objects and Timeline, click the object that you want to rename, single-click the object again, and then type the new name.