コンテナのテーブル表示を使用して実用的なソリューションを見つけました:
<div class="Toolbar">
<div>
<div class="btn-group">
<button id="ButtonCreate" class="btn btn-default btn-sm" onclick="CreateItem()" title="Erstellen"><span class="glyphicon glyphicon-file"></span></button>
<button id="ButtonUpdate" class="btn btn-default btn-sm" onclick="UpdateItem()" title="Bearbeiten"><span class="glyphicon glyphicon-pencil"></span></button>
<button id="ButtonDelete" class="btn btn-default btn-sm" onclick="DeleteItems()" title="Löschen"><span class="glyphicon glyphicon-trash"></span></button>
<button id="ButtonExport" class="btn btn-default btn-sm" onclick="ExportItems()" title="Exportieren"><span class="glyphicon glyphicon-export"></span></button>
</div>
</div>
<div>
<div class="input-group input-group-sm">
<span class="input-group-btn"><button id="ButtonSearch" class="btn btn-default btn-sm" onclick="SearchItem()" title="Suchen"><span class="glyphicon glyphicon-search"></span></button></span>
<input type="text" class="form-control" style="width: 300px;" placeholder="Suchen">
</div>
</div>
</div>
CSS (少ない):
.Toolbar
{
position: relative;
display: table;
}
.Toolbar > div
{
display: table-cell;
padding-right: 8px;
vertical-align: top;
}
.Toolbar
{
.btn-group, .btn-group-vertical
{
vertical-align: inherit;
}
}