Repro Steps:

1) Create a Page
2) Create a Component, rename the Root to "TestComponent"
3) Within the component, place a TextBlock with some text in it.
4) On the root Component titled "TestComponent", create a Dynamic Property of name "Foreground" and Type "Brush".
5) Select the TextBlock, and for the Foreground Property, Create a Binding.
6) Under the "Binding, select the "Name" tab, then find and select the "TestComponent" under the "ElementName" input.
7) Expand the list of available bindings, and search for for "Foreground_Brush" binding that was created in Step 4.

Observe how the "Foreground_Brush" attached property is not present.

8) Close the Component's tab in Studio, and re-open it from the Assets Panel.
9) Repeat steps 5-7.

Observe how the "Foreground_Brush" is now present.

Expected result: Dynamic Properties are immediately accessible within the component as soon as created.