title: Disable other menu items when one of the menu item is clicked c#
body: <p>I have a simple menu in a WPF Client C# application where the user should be able to select only one item at a time. If one of the items is selected, the other items should be disabled until the operation is completed. </p>
  
  <p>For example, I have the following menu</p>
  
  <pre><code> &lt;MenuItem Header="Help"&gt;
              &lt;Separator&gt;&lt;/Separator&gt;
              &lt;MenuItem Header="User Manual.." Click="UsageDocMenuItem_Click" /&gt;
              &lt;Separator&gt;&lt;/Separator&gt;
              &lt;MenuItem Header="Login"  Click="LoginItem_Click"/&gt;
              &lt;Separator&gt;&lt;/Separator&gt;
              &lt;MenuItem Header="About"  Click="AboutMenuItem_Click"/&gt;
              &lt;Separator&gt;&lt;/Separator&gt;
          &lt;/MenuItem&gt;`
  </code></pre>
  
  <p>If user clicks Login, User manual and About should be disabled until the operation trigerred by Login is finished. </p>
  
  <p>Which C# design or code method can be used to implement this?</p>