MaterialDesignColors | Android library which provides Google Material | Android library

Create a custom implicit style (without x:Key) for Button that is based on the MaterialDesign styles and only changes the CornerRadius of the ButtonAssist. It will be applied automatically to all Buttons in scope.

Create a separate resource dictionary for your button style, so it can be added after the resource dictionaries of MaterialDesign, otherwise they will override your style instead you overriding their default style. Please also be aware that local values will always override the values from the style.

it was because of Padding="15" must've pushed the content outside the button area

I'm not sure your explanation is clear on what your question is.. From what I understand you're asking how you would change the color of the text if it's less than 8 characters? If that's your question then 'string.Length' should suffice.

In general, you can get any MaterialDesignColor using the SwatchHelper.

You can create an empty style inside a ResourceDict like this:

As for the Button style, you simply forgot to specify the style which you defined in ModernButton.xaml. It is why that style is overridden by another style included in Material design package.

To fix this, set Style property of the Button.

The HorizontalDividerBorder and HorizontalExpanderContentTextBlock styles are not shipped with the Material Design library, they are local styles in their WPF demo application.

The styles are defined in MaterialDesignInXamlToolkit/MainDemo.Wpf/Expander.xaml. If you want to use them, just copy them over into a local resource dictionary in your project.

1. Create a new resource dictionary MaterialDesignWpfDemoStyles.xaml directly in your project and copy over the styles from the link above. It should look like this:

The behavior that you see is caused by the way you create your data templates. The ContentControl inside is instantiated for each cell, but the controls inside the setters of the styles are not. That means a single instance of both the button and the slider are shared among all cells. As a control in WPF can only have a single parent - or in other words can only appear once in the visual tree - it is only reassigned or moved between the cells.

In order to resolve the issue, do not create controls in a style, but in a data template, e.g.:

The Material Design brushes are used in various styles of controls using DynamicResource. That means if you replace or register a brush with the same x:Key at runtime, all dynamic references will be adapted and the change will be applied to all controls in scope of the resource dictionary where you defined it.

In general, you would have to copy the default style and template for the control that you want to apply the changed color to and adapt it, e.g. by creating a separate brush and using it instead of the original, given the values are assigned in the control template directly instead of template bindings.

In case of the TabablzControl there might be an easier way. From its default style at GitHub, I can only see one usage of PrimaryHueMidBrush that is set as BorderBrush in a Setter. You can ovewrite this in your style.