some improvements

Pilz.UI/Dialogs/DialogBase.cs

@@ -0,0 +1,30 @@
+namespace Pilz.UI.Dialogs;
+
+public partial class DialogBase : Form
+{
+    public FlyoutBase? DialogPanel { get; private set; }
+
+    private DialogBase()
+    {
+        Load += DialogBaseForm_Load;
+        FormClosed += DialogBaseForm_FormClosed;
+    }
+
+    public DialogBase(FlyoutBase? dialogPanel) : this()
+    {
+        DialogPanel = dialogPanel;
+    }
+
+    private void DialogBaseForm_Load(object? sender, EventArgs e)
+    {
+        if (DialogPanel is ILoadContent iLoadContent)
+            iLoadContent.LoadContent();
+
+        DialogLoading?.Invoke(new DialogLoadingEventArgs(this));
+    }
+
+    private void DialogBaseForm_FormClosed(object? sender, FormClosedEventArgs e)
+    {
+        DialogClosed?.Invoke(new DialogClosedEventArgs(this));
+    }
+}