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copied!<p>The direct cause of your problem is the lines:</p> <pre><code>taxCanvas.Height = GRight.ActualHeight; taxCanvas.Width = GRight.ActualWidth; </code></pre> <p>This sets a fixed size for your TimeAxis control, disabling any auto-resizing.</p> <p>Assuming your TimeAxis user control doesn't have any internal settings affecting measure, replacing the Height and Width settings with the following should cause your UserControl to resize automatically.</p> <pre><code>taxCanvas.HorizontalAlignment = HorizontalAlignment.Stretch; taxCanvas.VerticalAlignment = VerticalAlignment.Stretch; </code></pre> <p>This may not completely solve your problem however; your UserControl's desired size and layout size will be the same as that of the grid, but you will still need to manually resize the objects on your canvas. A Canvas doesn't have any provision for measure/arrange, so you'll have to handle this with code. Common techniques are:</p> <ol> <li>Wrapping the Canvas inside a ViewBox, which you already tried. You might try this again with the above lines changed.</li> <li>Adjusting the RenderTransform of the canvas using code or bindings (more efficient than adjusting LayoutTransform, and Canvas doesn't participate in layout anyway)</li> <li>Adjusting individual shape positions using code or bindings</li> </ol> <p>One gotcha to look out for: When you resize a canvas, it's contents aren't affected. So if you want to know whether your canvas is actually being resized, give it a background color. That way you won't waste time looking in the wrong place for a sizing problem.</p>

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