private void addPauseInputField(float pause, int pauseListIndex)
    {
        //instantiate a prefab and add it to buttonPanel - layout manager will do the rest
        GameObject createdPauseButton = Instantiate(pauseInputField.gameObject) as GameObject;

        createdPauseButton.transform.SetParent(buttonPanel);
        createdPauseButton.transform.localScale = scaleEqualizer;

        //pass all needed data and references so that pausebutton is able to change corresponding pause
        PauseInputField pauseInputFieldScriptObj = createdPauseButton.GetComponent <PauseInputField>();

        pauseInputFields.Add(pauseInputFieldScriptObj);
        pauseInputFieldScriptObj.PauseValue      = pause;
        pauseInputFieldScriptObj.PauseIndex      = pauseListIndex;
        pauseInputFieldScriptObj.ParentWavePanel = this;

        pauseInputFieldScriptObj.UpdateText();
    }
    public void RemoveGroup(GroupButton groupButton)
    {
        int groupIndex = wave.Groups.IndexOf(groupButton.Group);

        //dont let user delete the last group
        if (groupIndex == 0 && wave.Groups.Count == 1)
        {
            return;
        }

        #region substitute the currently selected group in the groupPanel(which will be deleted) by another

        GroupSelectionButton nextSelectedButton;

        //check if group with next index exists
        if (groupIndex + 1 < groupButtons.Count &&
            (nextSelectedButton = groupButtons[groupIndex + 1]) != null)
        {
            //just wait
        }
        else         //there must be a group with previous index
        {
            nextSelectedButton = groupButtons[groupIndex - 1];
        }

        groupPanel.OnSelectedGroupChange(nextSelectedButton);
        #endregion

        GroupSelectionButton btn = groupButtons[groupIndex];
        groupButtons.Remove(btn);
        Destroy(btn.gameObject);


        PauseInputField pauseBtn = pauseInputFields[groupIndex];
        pauseInputFields.Remove(pauseBtn);
        Destroy(pauseBtn.gameObject);

        wave.Groups.RemoveAt(groupIndex);
    }