Scroll is not working when Drawer is used

### Version
Tell us which versions you are using:

- react-native-router-flux v4.0.0-beta.31
- react v16.3.1
- react-native v0.55.4

Expected behaviour

if scrollview is used then the screen should scroll till the end of the element

Actual behaviour

The scroll is not working in UWP but all the other functionality is working as expected

Steps to reproduce
For non-obvious bugs, please fork this component, modify Example project to reproduce your issue and include link here.
1. Add the following code under the tag

{BackNavigationButton('back')}} title="Test" renderRightButton={() => {this.rightFilterButton()}} />

2. Then run the app