如何在其他控件之前显示工具栏？

I am new to WPF and having problems getting my GUI to display correctly. I have a Grid that has a toolbox and a UniformGrid in it. The UniformGrid has a bunch of buttons in it and there is a text box in the toolbox. My problem is unless the application window is full screen the buttons are on top of the Grid. How do I fix this, so that the buttons are bellow the grid. I am new to WPF and having problems getting my