I'm running Visual Studio 2008 with the RadControls ASP.NET AJAX.
More often than not, when I make a change in the source of my ASPX I lose ALL the controls on my form when I switch back to design mode.
What I've figured out is, if I make an error in my source, for example if it says:
telerik:RadTabStrip ID="RadTabStrip1" blah blah blah I delete the "I" in ID, then it'll say: "Design view is out of sync with Source view. Click here to synchronize views." I click that, then I go and put the "I" back in ID, then the "Design view is out of sync with source view" comes up again, I click that and then the control reappears in the design view.
If I do that for each of the controls that are missing it comes back. Then at some point they'll all disappear and then if I go through the process they'll come back again.
It also seems to come up the most when I put in a table or edit a table, then VS adds in some Style markup, if I delete the style markup, then go through the above process the controls will come back.
It's more of an annoyance than anything else, everything works, and I saw that there was a hotfix for something similar for VS2008, but that didn't help.
Perhaps a bug in VS2008? It only does it for my Telerik Controls though, the MS ones don't disappear.
I'm just curious to see if anyone else has run into this?
Brett