' Get the current row's primary key from the mmDataGrid
Dim PK As String = grdRecvEntry.GetCurrentRowPKs().ToString()

Error:
Attempted to access an element as a type incompatible with the array.

Stack Trace:
at OakLeaf.MM.Main.Windows.Forms.mmDataGridView.GetCurrentRowPKs()
at CE.Purchase.ReqForm.grdLineItems_MouseDown(Object sender, MouseEventArgs e) in E:\VS 2005 Projects\Purchase VB\ReqForm.vb:line 3867
at System.Windows.Forms.Control.OnMouseDown(MouseEventArgs e)
at System.Windows.Forms.DataGridView.OnMouseDown(MouseEventArgs e)
at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.DataGridView.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at CE.Purchase.AppMainEntry.Main() in E:\VS 2005 Projects\Purchase VB\Main.vb:line 70