Hi Yim Suet Joe,
Thanks for contacting Syncfusion Support.
We were unable to reproduce the reported issue,
Navigation drawer doesn’t display the content at our side. We have created a sample based on your code and tested, it is working in our side. We have tested the same with our latest Syncfusion Version (14.2.0.32). Please download the sample from the following link
Link http://www.syncfusion.com/downloads/support/forum/125693/ze/NavigationDrawer-158041639
Please check the sample and If the issue still persists, update us with Syncfusion version in which you are facing the issue and device details that will more help to analyze further and provide an appropriate solution.
Regards,
Hemalatha M.R.