How to create transparent and tangible component - Windows Form C#

Question

I’m looking to create a Panel who will always have the property BringToFront, capable of being fully transparent to the point where it shows components behind it and still be possible to click on it.

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Thanks for the help! :)

Answer 1

To make the Panel transparent adjust the property panel1.BackColor with the method Color.FromArgb where the alpha argument regulates the degree of transparency,

Example:

// Para uma cor sólida alpha deve ser 255
// Para completa transparência alpha deve ser 0
// Nesse caso alpha é 25
panel1.BackColor = Color.FromArgb(25, Color.Blue);

As for control over others the property TopMost only exists for Forms. What you can do is use the method Control.ControlCollection.SetChildIndex(Control, Int32) with a very high number compared to the other controls because even if you create or modify your sibling controls they will always be below it.

Example:

// Enquanto o child index dos outros componentes ficam entre 0 e 10 panel1 
//tem child index 10000 o que garante sempre estar por cima 
form1.setChildIndex(panel1, 10000);