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The Menu tool groups a set of elements and displays them as a drop-down menu as shown in the below image.

The C1MenuTool can be added using XAML code as shown below.
<!-- Add menu tool -->
<c1:C1MenuTool Label="Open">
<c1:C1MenuTool.IconTemplate>
<c1:C1IconTemplate>
<c1:C1BitmapIcon Source="/openProject.png" />
</c1:C1IconTemplate>
</c1:C1MenuTool.IconTemplate>
<c1:C1ButtonTool Label="Project..." >
<c1:C1ButtonTool.IconTemplate>
<c1:C1IconTemplate>
<c1:C1BitmapIcon Source="/open.png" />
</c1:C1IconTemplate>
</c1:C1ButtonTool.IconTemplate>
</c1:C1ButtonTool>
<c1:C1ButtonTool Label="Web Site...">
<c1:C1ButtonTool.IconTemplate>
<c1:C1IconTemplate>
<c1:C1BitmapIcon Source="/openWebSite.png" />
</c1:C1IconTemplate>
</c1:C1ButtonTool.IconTemplate>
</c1:C1ButtonTool>
<c1:C1ButtonTool Label="File...">
<c1:C1ButtonTool.IconTemplate>
<c1:C1IconTemplate>
<c1:C1BitmapIcon Source="/openFile.png"/>
</c1:C1IconTemplate>
</c1:C1ButtonTool.IconTemplate>
</c1:C1ButtonTool>
</c1:C1MenuTool>