llamar a CellMouseClick

 Dim b As MouseEventArgs = New MouseEventArgs(System.Windows.Forms.MouseButtons.Left, 1, MousePosition.X, MousePosition.Y, 0)
        Dim args As System.Windows.Forms.DataGridViewCellMouseEventArgs = New System.Windows.Forms.DataGridViewCellMouseEventArgs(0, principal.dgv_procesos.CurrentRow.Index, MousePosition.X, MousePosition.Y, b)

principal.dgv_procesos_CellMouseClick(sender, args)