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AlphaGradientPanel, an extended panel

, 24 Mar 2006 CPOL
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A panel that has rounded borders, gradients, and transparency.


This is a panel, first of all. Therefore, it has all the advantages of a panel, plus some nice little features.

Using the code

You'll just have to include the component in your toolbox and use it.

The only property that is a bit special is the Colors() property. It is a collection of items and has design-time visibility in the property grid. I'm still trying to achieve transforming the color name that appears in the property grid in a nice drawing... If anybody knows how that can be achieved, please, please, please, let me know Wink | ;)


  • Rounded corners (any one of them or all at the same time).
  • Gradients (from 2 to n colors, with some special effects).
  • Transparency (any color can be made transparent with an "Alpha" value between 0 and 255).
  • Borders, even with rounded corners, have a nice little border.
  • Image inclusion (position, opacity, size, grayscale, and padding).
  • Padding of the content, of the back, and of the docking.


  • Version 1.0.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Nicolas Wälti
Software Developer (Senior)
Switzerland Switzerland
No Biography provided

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Comments and Discussions

Questionimage alpha question Pin
bekiser1-May-13 8:23
memberbekiser1-May-13 8:23 
SuggestionA few changes needed to get this to work in .Net 4 Pin
Jonathan_Collins6-Jun-12 23:55
memberJonathan_Collins6-Jun-12 23:55 
GeneralMy vote of 2 Pin
Brad Barnhill6-Jan-12 17:49
memberBrad Barnhill6-Jan-12 17:49 
GeneralMy vote of 2 Pin
Dave Kreskowiak8-Apr-10 7:37
mvpDave Kreskowiak8-Apr-10 7:37 
QuestionIssue removing control from form(s) Pin
David Minder22-Dec-09 6:09
memberDavid Minder22-Dec-09 6:09 
QuestionOver controls??? Pin
Member 247284813-Oct-09 10:53
memberMember 247284813-Oct-09 10:53 
Generalfrustrating Pin
joe destefano8-May-09 12:45
memberjoe destefano8-May-09 12:45 
GeneralRe: frustrating Pin
joe destefano8-May-09 12:59
memberjoe destefano8-May-09 12:59 
GeneralRe: frustrating Pin
David Minder22-Dec-09 5:16
memberDavid Minder22-Dec-09 5:16 
QuestionAdding an AlphaGradientPanel at runtime? Pin
SMothes29-Sep-08 5:38
memberSMothes29-Sep-08 5:38 
AnswerRe: Adding an AlphaGradientPanel at runtime? Pin
Nick Waelti1-Oct-08 2:10
memberNick Waelti1-Oct-08 2:10 
GeneralTransparency problem Pin
zuraw13-Mar-08 5:06
memberzuraw13-Mar-08 5:06 
GeneralRe: Transparency problem Pin
cdebel26-Feb-09 10:49
membercdebel26-Feb-09 10:49 
QuestionException Pin
BBWicked1-Aug-07 0:46
memberBBWicked1-Aug-07 0:46 
your control is the best I have seen and used for a long time.
But I get an exception when I resize my main form on which are MANY nested AGPanels.
I can reproduce the failure if I resize the main window to a minum and the then back.
Or sometimes it happens just after minmizing and maximizing the window.

Here is a snippet of the exception(the part within double quotes I translated from german to english"):

System.NullReferenceException: "Object reference was not specified on an object instance."
at BlueActivity.Controls.AlphaGradientPanel.AlphaGradientPanel_Paint(Object sender, PaintEventArgs e)
at System.Windows.Forms.Control.OnPaint(PaintEventArgs e)
at System.Windows.Forms.Control.PaintTransparentBackground(PaintEventArgs e, Rectangle rectangle, Region transparentRegion)
at System.Windows.Forms.Control.PaintTransparentBackground(PaintEventArgs e, Rectangle rectangle)

Could you please help me to fix that bug, because I'm using your control on a project at work?

Best regards
Generalsorry but :) Pin
deltadirac29-Jul-07 9:05
memberdeltadirac29-Jul-07 9:05 
QuestionRemoving a color Pin
the-rpd1-Jul-07 6:20
memberthe-rpd1-Jul-07 6:20 
GeneralNice control Pin
the-rpd26-Jun-07 10:38
memberthe-rpd26-Jun-07 10:38 
GeneralRe: Nice control Pin
(Nick Waelti)28-Jun-07 1:11
member(Nick Waelti)28-Jun-07 1:11 
GeneralRe: Nice control Pin
the-rpd28-Jun-07 7:40
memberthe-rpd28-Jun-07 7:40 
GeneralUse in applications Pin
BryanTKinkel12-Jun-07 4:40
memberBryanTKinkel12-Jun-07 4:40 
AnswerRe: Use in applications Pin
Nick Waelti12-Jun-07 4:55
memberNick Waelti12-Jun-07 4:55 
GeneralRe: Use in applications Pin
BryanTKinkel13-Jun-07 5:29
memberBryanTKinkel13-Jun-07 5:29 
GeneralRe: Use Commercial in applications Pin
Matt Lowrance26-Sep-07 7:39
memberMatt Lowrance26-Sep-07 7:39 
GeneralRe: Use Commercial in applications Pin
Nick Waelti26-Sep-07 21:19
memberNick Waelti26-Sep-07 21:19 
GeneralPanel behind not visible Pin
JonnyNordin9-Jun-07 3:17
memberJonnyNordin9-Jun-07 3:17 

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