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It seems your VB.Net code is creating two <script> blocks with separate window.onload functions, causing the second chart (“ITU Zones”) to overwrite the first (“QSOs by Hour”), resulting in a blank first chart. To fix this, either combine the instantiation and render of both the charts within a single window.onload function in one <script> block, or place a single <script> block without window.onload at the end of the <body> tag to execute after the DOM loads. Both approaches ensure both charts render correctly in your Windows Forms app’s WebBrowser control.
If the issue persists, kindly create sample project (sample / dummy data) reproducing the issue you are facing & share it with us via Google Drive or OneDrive so that we can run it at our end to understand the scenario better & help you out.
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Vishwas R
Team CanvasJS