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Grid Calendar

Iam using grid version 1.5 and iam not able to use the cell type dhxCalendarA. What am i missing?

The support of dhxCalendarA has been added only in latest builds of version 1.5, so most probably it just not supported in version which you are using now. 
To add such support you need latest version of dhtmlxgrid_excell_dhxcalendar.js - you can take such file from latest 1.6 package available at dhtmlx.com - it will be compatible with 1.5 version ( in common case it not recommended to mix files from different version, but in case of dhxCalendar - it will work correctly )