VS Extension how to suppress reload project programatically

Hi,

We have a VS Extension and it can add our own assembly references into Windows forms and WPF projects.

In that after adding assemblies we are showing a confirmation dialog on the Extension Window.

At the same time Visual Studio prompts a message for reloading the project as it detects the change outside IDE.

After responding the reloading project even we closed our own confirmation dialog, the project is unusable and could not be closed normally. Please refer the screenshot below.

How we resolve this? Thanks in advance.

Thanks,

Bas

Regards, Bas