More branding – I’d rebranded the SharePoint calendar. It looks nice, and not ‘SharePoint Blue’. “Great”, I thought, “I give that a quick check and move on to the next task”. So I gave it a check – and found that while the DatePicker that appears in the left navigation of the page was fine, the DatePicker control which appears for Date & Time fields had not picked up the styles I’d defined.

Arse. Mine was supposed to be red, not blue. So I began to wonder where this control was actually coming from. It wasn’t coming from my page – viewing the source, it wasn’t there, and if it had been I’d’ve expected it to be styled.

I didn’t think it was dynamically produced by JavaScript – I was sure there was an .aspx file behind it. I had a nasty feeling, so I went and checked the _layouts directory, but didn’t see anything that looked related to DatePickers.

Next up I tried the IIS logs – and found it. I was right – the DatePicker was being generated by iframe.aspx – and it was in the _layouts directory. (This makes me wonder – is this the only place where an iframe is used in SharePoint? Would something like datepicker.aspx or even datepickeriframe.aspx not have been a more obvious name?)

Anyway, so it’s in the _layout directory. It’s trivial to change it so that it also uses my stylesheet – but that will change it farm-wide, or configuration changes. I guess I’ll be looking at kb-944105 how to customize application pages in the layouts folder in wss 3 and moss 2007.

Edit: Michelle has an excellent suggestion, and she’s blogged about it here. It’s still a hack, really, but there are worse ones!