Visual Studio Toolbox angst

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Visual-Studio

Arghhhhh!!!

Can someone explain this for me? I want to use a custom user control from one project in the design view of a form in another project in the same solution. So, I think to myself, OK I'll add the control to the toolbox (no problem there, I either use the 'Choose Toolbox Items' option or I drag the assembly onto the toolbox) and then I drag the control on to my form. Simple. Why oh why doesn't the control on the form update when I make changes to the control class after it's been added to the form? I added some properties to the control but they aren't offered up to me in the properties box when I select the control on the form. I thought I'd try to get around it by adding the code into the designer file (I know I shouldn't but bear with me) and it compiled fine, but when I try to view the form in design view I get a bunch of warnings telling me those properties don't exits (even though it compiles!!!) X| X| X|

I'm thinking it somehow retains the assembly version for that particular control for the designer but I can't find that anywhere. It's driving me nuts!