How to create a panel (something like the Inspection Results)

See https://www.jetbrains.org/intellij/sdk/docs/user_interface_components/tool_windows.html

Thank you, that is a good start. But how can I control the ToolWindow from my Action.

I want to hide the ToolWindow first and when a click the Button of my Plugin the ToolWindow should be displayed.

How can I do this?

You can register your tool window in plugin.xml like this:

    <toolWindow id="ID" anchor="right" secondary="false" icon="..."
                factoryClass="path.to.YourToolWindowFactory"
                conditionClass="path.to.YourToolWindowFactory"/>

In this case your YourToolWindowFactory is responsible for:

- tool window content creation

- availability for a certain kind of project (Project can be irrelevant for your plugin if it doesn't have some specific frameworks/files/modules. For this purpose your factory implements Condition<Project> but you can omit it as well as conditionClass parameter in plugin.xml)

-it can override default behavior of method shouldBeAvailable() to false and button won't be visible at the startup

Later 'when a click the Button' you just call toolWindow.show() or ToolWindowManager.getInstance(...).getToolWindow(ID).show()

Thanks for the reply,

but the Method ToolWindowManager.getInstance(...).getToolWindow(ID).show() requires a Runnable. But first the ID from the plugin.xml is not avaible, I get a null for the getToolWindow(ID). :(

Ok I solved this myself. If the Condition returns false in the value() Method I get a null if I try to get the ToolWindow with getToolWindow(ID). First I thought the value method in the Condition is responsible if the Toolwindow is visible or not.