Open/Close AddTournamentModal

Apollon.WPF/Commands/CloseModalCommand.cs

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+using Apollon.WPF.Stores;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Apollon.WPF.Commands
+{
+    public class CloseModalCommand : CommandBase
+    {
+        private readonly ModalNavigationStore _modalNavigationStore;
+
+        public CloseModalCommand(ModalNavigationStore modalNavigationStore)
+        {
+            _modalNavigationStore = modalNavigationStore;
+        }
+
+        public override void Execute(object parameter)
+        {
+            _modalNavigationStore.Close();
+        }
+    }
+}

Apollon.WPF/Commands/CommandBase.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace Apollon.WPF.Commands
+{
+    public abstract class CommandBase : ICommand
+    {
+        public event EventHandler CanExecuteChanged;
+
+        public virtual bool CanExecute(object parameter)
+        {
+            return true;
+        }
+
+        public abstract void Execute(object parameter);
+
+        protected virtual void OnCanExecutedChanged()
+        {
+            CanExecuteChanged?.Invoke(this, new EventArgs());
+        }
+    }
+}

Apollon.WPF/Commands/OpenAddTournamentCommand.cs

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+using Apollon.WPF.Stores;
+using Apollon.WPF.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Apollon.WPF.Commands
+{
+    internal class OpenAddTournamentCommand : CommandBase
+    {
+        private readonly ModalNavigationStore _modalNavigationStore;
+
+        public OpenAddTournamentCommand(ModalNavigationStore modalNavigationStore)
+        {
+            _modalNavigationStore = modalNavigationStore;
+        }
+
+        public override void Execute(object parameter)
+        {
+            AddTournametViewModel addTournametViewModel = new AddTournametViewModel(_modalNavigationStore);
+            _modalNavigationStore.CurrentViewModel = addTournametViewModel;
+        }
+    }
+}