plotting - How to change color dynamically?

I am new to Mathematica and want to change the FillingStyle Dynamically in this Plot. I want that when I pick a color from the "Color" then, it should dynamically change in the Sin plot.

 a = RGBColor[1, 2, 0]
 Row[{Button["<>", a = SystemDialogInput["Color"]], 
Evaluate[Plot[Sin[m], {m, -Pi, Pi}, Filling -> Bottom, 
FillingStyle -> Dynamic[a]]]}]

I am able to pick a color but the plot is not changing dynamically. But, it changes when I am executing it again.

Answer

The expression FillingStyle -> value is not preserved in the output Graphics expression of Plot, therefore it cannot be changed after-the-fact in that fashion. Instead you need to regenerate the plot when the value of a changes, meaning that Dynamic needs to surround Plot:

a = RGBColor[1, 2, 0]
Row[{Button["<>", a = SystemDialogInput["Color"]], 
  Dynamic @ Plot[Sin[m], {m, -Pi, Pi}, Filling -> Bottom, FillingStyle -> a]}]

Mathematica graphics

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