Environment

• CLI: 6.1.2
• Android Runtime: 6.1.2
• iOS Runtime: 6.1.0
• nativescript-theme-core: 2.0.24
• Using Nativescript iwth Angular

Describe the bug
When setting a class on the ActionBar or a GridLayout inside of it, css inheritance doesn't work.

To Reproduce

1. Create a component with the html:

<ActionBar class="interit-test">
  <GridLayout class="inherit-test">
    <Label text="I want to be red"></Label>
  </GridLayout>
</ActionBar>

2. Add this to the css file:

.inherit-test {
  color: red;
}

3. See that the label isn't red but black.

Expected behavior
The label should be red since it should ingerit the color from the GridLayout and the ActionBar.