I am not sure what might be causing this in your case. Here is a small example which seems works as expected on my end:
RadContextMenu contextMenu =
RadMenuItem menuItem =
sender, EventArgs e)
sender, MouseEventArgs e)
(e.Button == System.Windows.Forms.MouseButtons.Right)
contextMenu.Show(radListView1, e.X, e.Y);
If you continue experiencing issues, please provide me with a snippet of your code and I will gladly look into it.
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