First steps

1. Open Visual Studio and click Add new project. Select the Extensibility category under TwinCAT HMI as the project type.
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2. Right-click on the project and execute a project build (Build Project).
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3. Add a new HMI project to the existing solution by right-clicking the Add new project solution. Select an HMI project.
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4. Right-click on the "Framework" node in the HMI project and select "Manage Extensions...".
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5. Select Framework Control in the TwinCAT HMI Extension Management window and confirm the dialog with OK.
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6. If you have opened a View/Content/UserControl file, you have to reload the page. This is illustrated by a note. Click Reload.
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The framework control is now available in the toolbox.
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7. Use drag & drop to add the framework control to an open View/Content/UserControl file.
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You can now use the framework control like a normal control.
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All changes in the source code of the framework control require a project build (see step 2) to ensure that the changes are adopted in the Engineering.