tabBox宽度不会展开以包含情节

Question

从此页面上的代码开始：enter link description here，我希望能够控制第一个tabBox的选项卡1上的方框图的大小。在下面的代码中黑客攻击几个滑块和uiOuput调用，我现在可以轻松控制箱线图的高度和宽度。但是，虽然tabBox在高度上很好地扩展以包含绘图，但它的宽度不会扩展。在高宽度值时，绘图在框的边界上延伸。我看到类似的结果使用一个简单的Box来包含该图。

有没有办法改变Box / tabBox的宽度以获得所需的效果？

  library(shiny)
  library(shinydashboard)

  body <- dashboardBody(
  fluidRow(
     tabBox(
        title = "First tabBox",
        # The id lets us use input$tabset1 on the server to find the current tab
        id = "tabset1", 
        tabPanel("Tab1", "First tab content", uiOutput('UI_test')),
        tabPanel("Tab2", "Tab content 2")
     ),
     tabBox(
        side = "right", 
        selected = "Tab3",
        tabPanel("Tab1", "Tab content 1"),
        tabPanel("Tab2", "Tab content 2"),
        tabPanel("Tab3", "Note that when side=right, the tab order is reversed.",
                 sliderInput('sldHt', 'Height', min=100, max=500,
                             value=200, step=10),
                 sliderInput('sldWd', 'Width', min=100, max = 500,
                             value=200, step=10)
        )
     )
  ),
  fluidRow(
     tabBox(
        # Title can include an icon
        title = tagList(shiny::icon("gear"), "tabBox status"),
        tabPanel("Tab1",
                 "Currently selected tab from first box:",
                 verbatimTextOutput("tabset1Selected")
        ),
        tabPanel("Tab2", "Tab content 2")
     )
  )
  )

  shinyApp(
  ui = dashboardPage(
     dashboardHeader(title = "tabBoxes"),
     dashboardSidebar(),
     body
  ),
  server = function(input, output) {
     # The currently selected tab from the first box
     output$tabset1Selected <- renderText({
        input$tabset1
     })
     output$UI_test = renderUI({
        plotOutput('test',
                 height = input$sldHt,
                 width = input$sldWd)
     })
     output$test = renderPlot(
        boxplot(len ~ dose, data = ToothGrowth,
              boxwex = 0.25, at = 1:3 - 0.2,
              subset = supp == "VC", col = "yellow",
              main = "Guinea Pigs' Tooth Growth",
              xlab = "Vitamin C dose mg",
              ylab = "tooth length",
              xlim = c(0.5, 3.5), ylim = c(0, 35), yaxs = "i"))
  }
  )