Google calendar issue

[fst]

Hi,

I've been trying to get my google calendar to show up in the native agenda app of my HTC Desire. Without success so far...
After consulting some threads from people with similar issues I've tried:
-clearing calendar data
-clearing calendar storage data
-rebooting

Nothing worked. I even lost a bunch of stuff since now, the only calendar I can choose in the app is "PC Sync".

Could anyone tell me how I can get my google calendar to show up on my phone?...
My google email account is synchronizing correctly.