Thumbnaillistview on a dialog form

I am having trouble with a "ThumbnailListView" windows control on a window form.

I can add the control, load it with thumbnails and all is well until I call up the dialog again and the thumbnails disappear. They are still in the list because the items.count is what I would expect.

Basically I have a main form and I have a dialog form which is created and never disposed. The dialog form has the thumbnaillistview control and is populated with thumbnails only once to increase performance.

The main form uses the showdialog method to show the dialog form and all is well for the first time but the second time the thumbnail items disappear.

If I change the showdialog to show it works fine.

Any ideas ?

Many thanks in advance.

Regards

Paul.

I have attached a sample project which demonstrates my problem. You will need to correct the image paths within the load of the main form.

What you should find is that when you call up the thumbnail form the first time the thumbnail images are displayed and the second time they disappear. If you examine the items.count property you will see that the image count is correct.

If you change the ".showdialog" method to ".show" then it works fine.

Regards

Paul.

Edited by user Sunday, March 13, 2011 4:00:10 AM(UTC)  | Reason: Not specified

File Attachment(s):

ThumbnailTest.zip (6,374kb) downloaded 2 time(s).

Thanks for your reply. I thought it may be something to do with Modal because if the dialog is disposed then it works fine.

Is there a work-around for this in the short term ? I need the form to be Modal (.showdialog) but I want to avoid loading the thumbnails each time.

I did find a way round it by declaring the thumbnailview and it's thumbnails in the mainform once only and passing it as a parameter each time to the dialog form but that's not ideal.

Regards

Paul.