Folder Structure:
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BaseControlStyles
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This folder contains the unnamed styles that are picked up by default for the
controls contained within the WPF libraries (Button, ComboBox, RadioButton, etc...)

Brushes
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This folder contains all color and brushes used by the controls, e.g. SolidColor
Brushes, Gradient Breushes, Drawing Brushes, etc.

CustomControlStyles
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This folder contains all styles for CustomControls. These are subclasses controls
that have a Style/Template that defines the loook and feel. For example the 
ContentAndTextButton.

Named Styles
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This folder contains all named style (i.e. the ones with a x:Key). These styles
are used when we can't rely on the default style of the conrol, even when we
have created that default style. An example is the a help button which needs
round corners or specialy styled buttons for a toolbar.