[TIDOC-1754][TIDOC-1768][TIDOC-1778] Multiple fixes
  * Fix example for AlertDialog
  * TextArea.returnKeyType not supported on Android
  * Cannot modify columns for Date-Time Pickers
[TIDOC-1789] Fix platform support
Merge pull request #5928 from bhatfield/tidoc-1754

[TIDOC-1754][TIDOC-1768][TIDOC-1778] Multiple fixes