Other functions are not working within events in windows application

Hi I am using Axvlcpulgin in my windows application.

So in the end reached event,

1.am not able to display the label message,

2.cannot able to remove items or retrieve listbox items index.

Such operations r not working in this event.

listcustr.Items.Remove(listcustr.Items.Item(0))

At this point,its hanging and in

Output window,i got the message like this.

A first chance exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll

In all events of vlcplugin,its the same case.

Anybody has any idea!

Thanks in Advance