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    <p>Changing the code like shown below will draw a right aligned thin line from transparency to black opaque.</p> <pre><code>linGrBrush := TGPLinearGradientBrush.Create( MakePoint(R.Width-189,0), MakePoint(R.Width,2), MakeColor(0, 0, 0, 0), MakeColor(255, 0, 0, 0)); Pen := TGPPen.Create( linGrBrush,3); Graphics.DrawLine(Pen,R.Width-189,79,R.Width,79); InvalidateRect(Handle,Rect(0,0,R.Width,R.Height),False); </code></pre> <p><strong>Update</strong>, using <code>InvalidateRect</code> for the whole area forces a total redraw of the frame. Otherwise the redraw might be clipped in strange ways. This will solve your color change effect.</p> <p>But a <code>GlassFrame</code> defect is illustrated with the last two images below. The outside frame of the TFrame is not correctly visible on the top and upper sides. </p> <p><img src="https://i.stack.imgur.com/1wuHB.png" alt="enter image description here"></p> <p><img src="https://i.stack.imgur.com/50ooW.png" alt="GlassFrame enabled"> <img src="https://i.stack.imgur.com/WrBsH.png" alt="GlassFrame disabled"></p> <p>Showing dysfunction of TFrame when <code>GlassFrame</code> is enabled (left). The right picture shows a complete black frame (even though in this picture the right side was cropped in compression) with <code>GlassFrame</code> disabled.</p> <p><strong>Update 2 :</strong></p> <p>Enable <code>SheetOfGlass</code> and everything seems ok.</p> <p><img src="https://i.stack.imgur.com/zviWG.png" alt="enter image description here"></p> <p><strong>Update 3 :</strong></p> <p>The <code>GlassFrame</code> top property was set to 40, and caused the strange border effect around the frame. Setting it to 0 fixed this issue.</p>
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    1. COThanks! But it isn't what I want. Please download the project above and resize the form, you will see that colors of the rectangle change.
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    2. COSee my update. Still a strange effect when switching on/off glassframe. Frame edges starts around height 35 on both sides with glassframe on. Seems to be a bug in the system somewhere.
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    3. COThe glassframe dysfunction is more visible if you comment away the PaintWindow procedure, and switch glassframe on/off.
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